40Ar/39Ar data (hornblende, biotite, muscovite, and K-feldspar) and U/Pb data (zircons) were obtained from the Nanga Parbat-Haramosh Massif (NPHM), NW Pakistan, along three transects in the southern regions of the NPHM. We have based our interpretations on our new data as well as geochronologic dates from previous studies in the northern regions of the massif. Geochronologic data show that the NPHM has experienced exceptionally high denudation and cooling rates over the past 10 m.y. U/Pb ages determined through sensitive high-resolution ion microprobe (SHRIMP) ''depth-profiling'' experiments on metamorphic zircons and conventional U/Pb monazite dates suggest that the timing of metamorphism varied across the massif. In addition, we have documented that the massif has experienced postmetamorphic, differential cooling both along and across strike. Thermochronologic data on currently exposed surface rocks suggest that cooling occurred more recently and at greater rates in the south-central regions of the massif (representing deeper crustal levels) than along the margins and northern regions of the massif. Within the Tato region, cooling following peak metamorphic temperatures of 600¿--700 ¿C was as high as 140 ¿C/m.y. following partial melting of pelitic units. Biotites from this area record plateau ages of 0.9¿0.1 Ma. Along the Astor and Indus gorges, cooling was less rapid (approximately 70¿--80 ¿C/m.y.) following peak metamorphism as indicated by U/Pb monazite ages of 6--8 Ma and zz40Ar/39Ar muscovite cooling ages of 2.2--3.4 Ma. Cooling over the last 3 m.y. occurred at rates of 100¿--140 ¿C/m.y. The overall cooling age pattern within the massif is interpreted syntaxial growth through the development of north plunging antiforms prior to 3 Ma, followed by reverse faulting along east dipping fault zones. Along the Raikot River transect the biotite cooling age pattern is consistent with the folding of isotherms during folding of the foliation surfaces. The age pattern was disrupted at 1 Ma due to faulting along the Raikot and Tato faults. ¿ American Geophysical Union 1996